Conceit of lions (5)
I believe the answer is:
pride
I believe this is a double definition.
'conceit' is the first definition.
(I've seen this before)
'lions' is the second definition.
(pride is the collective noun for a group of lions)
'of' is the link.
(Other definitions for pride that I've seen before include "Deadly sin (of lions?)" , "cause of swelling?" , "'. . . . goes before a fall'" , "Novel by Jane Austen" , "Arrogance - self-respect" .)